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/*
 * Fabric3
 * Copyright (c) 2009-2011 Metaform Systems
 *
 * Fabric3 is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version, with the
 * following exception:
 *
 * Linking this software statically or dynamically with other
 * modules is making a combined work based on this software.
 * Thus, the terms and conditions of the GNU General Public
 * License cover the whole combination.
 *
 * As a special exception, the copyright holders of this software
 * give you permission to link this software with independent
 * modules to produce an executable, regardless of the license
 * terms of these independent modules, and to copy and distribute
 * the resulting executable under terms of your choice, provided
 * that you also meet, for each linked independent module, the
 * terms and conditions of the license of that module. An
 * independent module is a module which is not derived from or
 * based on this software. If you modify this software, you may
 * extend this exception to your version of the software, but
 * you are not obligated to do so. If you do not wish to do so,
 * delete this exception statement from your version.
 *
 * Fabric3 is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the
 * GNU General Public License along with Fabric3.
 * If not, see .
 *
 * ----------------------------------------------------
 *
 * Portions originally based on Apache Tuscany 2007
 * licensed under the Apache 2.0 license.
 *
 */
package org.fabric3.spi.component;

import org.fabric3.spi.invocation.WorkContext;


/**
 * Provides lifecycle management for an implementation instance associated with an {@link org.fabric3.spi.component.AtomicComponent}.
 *
 * @version $Rev: 9763 $ $Date: 2011-01-03 00:48:06 +0000 (Mon, 03 Jan 2011) $
 */
public interface InstanceWrapper {

    /**
     * Returns the instance managed by this wrapper.
     *
     * @return the instance managed by this wrapper.
     */
    Object getInstance();

    /**
     * Returns true if the instance is started.
     *
     * @return true if the instance is started.
     */
    boolean isStarted();

    /**
     * Starts the instance,issuing an initialization callback if the instance is configured to receive one.
     *
     * @param context the current work context
     * @throws InstanceInitializationException if an error occurred starting the instance
     */
    void start(WorkContext context) throws InstanceInitializationException;

    /**
     * Stops the instance, issuing a destruction callback if the instance is configured to receive one..
     *
     * @param context the current work context
     * @throws InstanceDestructionException if an error stopping the instance occurs
     */
    void stop(WorkContext context) throws InstanceDestructionException;

    /**
     * Callback received when component reference wire(s) are updated. The instance will be injected with updated wires when {@link #reinject()} is
     * called.
     *
     * @param referenceName the reference name
     */
    void updated(String referenceName);

    /**
     * Callback received when a wire from a 0..1 or 1..1 reference or all wires from a multiplicity reference have been removed. The instance will be
     * injected with updated wires when {@link #reinject()} is called.
     *
     * @param referenceName the reference name
     */
    void removed(String referenceName);

    /**
     * Reinjects updated references on an instance.
     *
     * @throws InstanceLifecycleException if an error occurs during reinjection
     */
    void reinject() throws InstanceLifecycleException;
}